SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 7: Computational Magnetism
MA 7.5: Vortrag
Montag, 27. März 2023, 16:00–16:15, HSZ 02
Microscopic Insights for Beyond Room-Temperature Ferromagnetism in Two-Dimensional Fe5-xNixGeTe2 — Sukanya Ghosh1, Soheil Ershadrad2, and •Biplab Sanyal3 — 1Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden — 3Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
The FenGeTe2 (n=3-5) (FGT) systems belong to the class of two-dimensional (2D) van der Waals (vdW) materials, promising candidates to explore magnetism in low-dimension with potential applications in spintronics. These systems are special due to their tunable structural, electronic and magnetic properties. Among the existing members of FGT family, Fe5GeTe2 has room temperature ferromagnetism with several intriguing properties. With the inclusion of dynamic electron correlation effect, our DFT+DMFT study shows how the spin moments, exchange interactions and Curie temperature (TC) of 2D Fe5-xGeTe2 can be varied significantly by substitutional doping with Ni. More importantly, the highest TC ~400 K is achieved for 20% doping concentration, beyond which the ferromagnetic order gets gradually suppressed. Our DFT+DMFT results are in good agreement with the experimental reports on bulk Fe5-xNixGeTe2 [1]. Moreover, we investigate the microscopic mechanisms responsible for the observed trend of TC in Fe5-xNixGeTe2 monolayer as an interplay between specific magnetic exchange interactions.
1. X. Chen et al, Phys. Rev. Lett. 128, 217203 (2022).